Trump threatens European countries over their inaction in the Strait of Hormuz.
Comments made during a press briefing highlight tensions between the US and EU.
Potential implications for NATO's cohesion and future operations.
Briefing: Trump administration sidelines, threatens Europe in Iran war: EU flounders in new world order
Strategic angle: US President Donald Trump issues stark warnings to European nations regarding their role in the Iran conflict, raising concerns about NATO's future.